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Length evolution of fused-ring electron acceptors toward optimal blend morphology in polymer solar cells incorporating asymmetric benzodithiophene-based donors

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Abstract

Two new wide-bandgap polymers (PBDTBDD-Ph and PBDTBDD-PhPh) with different aggregation degrees and fused-ring electron acceptors (FREAs) (ITIC-4T, ITIC-3T and ITIC-2T) with different sizes were synthesized. The work was used to understand how to design the donor polymers and fused-ring electron acceptors (FREAs) for high-performance non-fullerene polymer solar cells (NF-PSCs). The results clearly demonstrated that weakly aggregated donor polymers and small-sized FREAs in appropriate degrees can match well with each other to achieve high power conversion efficiencies (PCEs). In other words, small-sized FREAs can be embedded more easily into the interspace of polymer chains and weakly aggregated polymers can offer larger space for the intercalation of FREAs. As a result, an NF-PSC device based on weakly aggregated polymer PBDTBDD-Ph and small-sized ITIC-3T yielded over 11% PCE. Thus, it would offer a feasible guideline to design high-performance NF-PSCs that meet the requirement of future industry-scale production.

Graphical abstract: Length evolution of fused-ring electron acceptors toward optimal blend morphology in polymer solar cells incorporating asymmetric benzodithiophene-based donors

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Publication details

The article was received on 26 Nov 2018, accepted on 29 Jan 2019 and first published on 29 Jan 2019


Article type: Paper
DOI: 10.1039/C8TA11363G
Citation: J. Mater. Chem. A, 2019, Advance Article

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    Length evolution of fused-ring electron acceptors toward optimal blend morphology in polymer solar cells incorporating asymmetric benzodithiophene-based donors

    Q. Zhu, D. Liu, Z. Lu, C. Gu, K. Zhang, X. Bao, Q. Li and R. Yang, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C8TA11363G

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